php_upload | File Upload library

The problem was in first line $estate = Estate::create($request->all());

So, from blade I receive a name="estate_image[] data which is an array, and Laravel tried to adds an array in database cell. In database cell cold be added just string value and through that, I had that error.

Solve it, by deleting this column from database and deleting this from $fillable variable in main model.

Quite stupid and easy thing from me, but hope, this answer helps someone. :-)